I've done it for twins once. You gotta pay more attention to facial features because hair changes obviously. The easiest tell was there was a spot/ freckle besides on of their mouths but in the same are on the other twin it was more of a smeared bruise looking spot.

These twins in particular we're clones in terms of personality.
They could do the creepy finish each other's sentences thing, and would very often. Last I saw of them was before they went off to different colleges tobreak the link.

Not to go into too much personal detail, but I was as close as could be to these sisters without dating one of them. They disagreed on stuff and would call each other out on things, but it would only be on things that they also did without realizing it. If they had a difference in personality I never saw it.

That's when they would have reshot it when they noticed, plus if they wanted to change the contract at that point they would need to renegotiate putting the brothers agent in a massively powerful position as it would have bee4n the director's fault for not noticing and he was dealing with children so they wouldn't be held to account like adults would it would be written off as children being children.

Twins. I dated twins back and forth between the two for about two months in high school. Started with one, she was too busy (as busy as a high school girl can be) and it didn't work out, her sister asked me out, it went back and forth about four times until I was out with one and she had switched with her sister. Twins are weird.